An Improved Control Scheme of Gyro Stabilization Electro-Optical Platform

In this paper, the performance indices of a gyro stabilized electro-optical system are analyzed and an index of zero steady-state error is put forward upon application and system´s robust requirement. The article first analyzes one classical control scheme which is based on angular rate feedback and designed in frequency domain. This design has the advantage of fast response and excellent dynamic performance, but it can not achieve zero steady-state error. Then, in order to realize zero steady-state error of angular output when facing disturbances from carrier, a PII² (proportional-integral-double integral) control scheme is proposed. The PII² scheme is designed through the method of pole placement and also has excellent dynamic performance, such as fast response and less overshoot, as the classical control scheme. At the same time, because of its double integrals, PII² can achieve zero steady-state error of angular output, which is satisfactory with the requirement of system application. Simulation and experiment with the PII² design are given by the article, and it shows a satisfactory result. At last, since the performance of pole placement method depends on the precision of closed-loop model, the article also evaluates the effects of model uncertainty on the output curve.